I currently have a 4S and will be getting my new 5S delivered today. I ordered directly from Apple. What's the best way to activate my new 5S, for use with AT&T, from home? I will be restoring from a backup on my PC using iTunes. Confused on how and where to start.
I don't know how AT&T does it, but I'm sure most carriers are similar. In my case, I also moved from a 4s to a 5s earlier this week and am with Bell Mobility in Canada. They have an online tool to do it.
Assuming the process is similar, you need to make sure there is a SIM in the new phone when you set it up. When presented with the option to set up from a backup, do that (iCloud or iTunes). Make sure you've moved over all your purchases and if using iTunes, I recommend doing an encrypted backup so all your passwords move over as well. Finish the setup before setting it up with your carrier.
You'll need two pieces of information when your transfer your existing plan to the new phone, the ICCID and IMEI for the new phone. First item is the phone's ID and second ID of the SIM. These can be found under Settings->General->About.
When entering these items into my carrier's online tool, they needed to verify that I owned the OLD phone. A verification text was sent to me with a code which I entered. I entered that into the tool and then a confirmation email was sent to me with some other info .
Upon reboot of the new phone, my service was active on the 5s and the 4s showed "No Service"
Of course AT&T may do it differently, but however you do it with them, the process should be similar.
Enjoy the new phone. The 4s to 5s upgrade is a great one.